82 Aquarii

Last updated
82 Aquarii
Observation data
Epoch J2000       Equinox J2000
Constellation Aquarius
Right ascension 23h 02m 32.55694s [1]
Declination −06° 34′ 26.4458″ [1]
Apparent magnitude  (V)6.15 [2]
Characteristics
Evolutionary stage giant
Spectral type M2 III [3]
U−B color index +1.90 [2]
B−V color index +1.58 [2]
Variable type suspected [4]
Astrometry
Radial velocity (Rv)−3.59±0.17 [1] km/s
Proper motion (μ)RA: −7.224 [1] mas/yr
Dec.: −33.786 [1] mas/yr
Parallax (π)3.6764±0.1715  mas [1]
Distance 890 ± 40  ly
(270 ± 10  pc)
Details
Radius 56.33+5.50
−7.78 [1]   R☉
Luminosity 692.8±37.1 [1]   L☉
Temperature 3,946+305
−180 [1]   K
Other designations
82 Aqr, NSV 25999, BD−07°5913, HD 217701, HIP 113781, HR 8763, SAO 146465 [5]
Database references
SIMBAD data

82 Aquarii is a star in the equatorial constellation of Aquarius. 82 Aquarii is its Flamsteed designation. It has an apparent visual magnitude of 6.15, [2] which, according to the Bortle Dark-Sky Scale, means it is a faint star that requires dark rural skies to view. The annual parallax shift of 82 Aquarii is 3.6764±0.1715  mas , which equates to a distance of roughly 890 light-years (270 parsecs ) from Earth. [6] Because this star is positioned near the ecliptic, it is subject to lunar eclipses. [7]

This object is an aging red giant star currently on the asymptotic giant branch [8] with a stellar classification of M2 III, [3] having exhausted both the hydrogen and helium at its core and expanded to 56 times the Sun's radius. [1] It is a suspected variable star of unknown type that ranges in magnitude between 6.24 and 6.29. [4] The star is radiating 693 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 3,946 K. [1]

References

  1. 1 2 3 4 5 6 7 8 9 10 11 Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics . 616. A1. arXiv: 1804.09365 . Bibcode: 2018A&A...616A...1G . doi: 10.1051/0004-6361/201833051 . Gaia DR2 record for this source at VizieR.
  2. 1 2 3 4 Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode:1966CoLPL...4...99J.
  3. 1 2 Kimeswenger, S.; et al. (January 2004), "J - K DENIS photometry of a VLTI-selected sample of bright southern stars", Astronomy and Astrophysics, 413 (3): 1037–1043, Bibcode:2004A&A...413.1037K, doi: 10.1051/0004-6361:20031576 .
  4. 1 2 Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1, 61 (1): 80–88, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID   125853869.
  5. ↑ "82 Aqr -- Variable Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg , retrieved 2012-07-16.
  6. ↑ van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv: 0708.1752 , Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID   18759600.
  7. ↑ Meyer, C.; et al. (1995), "Observations of lunar occultations at Observatoire de la Cote d'Azur", Astronomy and Astrophysics Supplement, 110: 107, Bibcode:1995A&AS..110..107M.
  8. ↑ Eggen, Olin J. (July 1992), "Asymptotic giant branch stars near the sun", Astronomical Journal, 104 (1): 275–313, Bibcode:1992AJ....104..275E, doi:10.1086/116239.
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